Because of the difference between the nylon alloy and metal materials, the discussion about how to design worm wheels with the nylon alloy is given.

本文还就尼龙合金与金属性能的不同，对如何设计尼龙合金蜗轮进行了初步的探讨。

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He invented and patented a series of combination locks with lead balls to block x-rays, in conjunction with special nylon wheels to prevent them from observed.

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